Pentair Mastertemp 250K NG

theutel

New member
Feb 9, 2020
2
Longboat Key, FL
Does anyone know the life expectancy of the thermal regulators used in the Pentair Natural Gas Mastertemp pool heater? I usually get 6 months before I need to replace due to short cycling, I have a pool service maintaining the pool which is a salt water pool. Can't seem to get straight answers. Thanks!
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
12,907
Northern NJ
The thermal regulator should last years, not months.

Have you had the removed thermal regulator returned to you to see what the problem is? The thermal regulator is sensitive to water chemistry and can get erosion.

Pentair MasterTemp Heaters - Thermal Regulator

What test kit do you use to test your water chemistry? Can you post your own test results?

FC
CC
pH
TA
CH
CYA

and can you create your signature with details of your pool.